I have an '00 BS and had the same questions. If you don't have service records of an IMS upgrade and it isn't in the LNE database, you can't tell without removing the transaxle. One exception would be the LNE "Solution," which adds an external oil line from the base of the spin-on filter to the bell housing. That's something you can easily see from underneath the car.
I tried to get prior service records from my local Porsche dealer, for my BS that came from another state. Basically, unless you can contact the shop where service was performed, you're probably out of luck. There isn't a national database of Porsche service, especially for older cars. Sorry!
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